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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 4982–4985

Ultrasensitive refractive index sensor based on a Mach–Zehnder interferometer created in twin-core fiber

Zhengyong Li, Changrui Liao, Yiping Wang, Xiaopeng Dong, Shen Liu, Kaiming Yang, Qiao Wang, and Jiangtao Zhou  »View Author Affiliations

Optics Letters, Vol. 39, Issue 17, pp. 4982-4985 (2014)

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We proposed and experimentally demonstrated a twin-core fiber (TCF)-based Mach–Zehnder interferometer (MZI) to develop an ultrasensitive refractive index (RI) sensor. This fiber MZI was constructed by splicing a short section of TCF between two sections of single mode fibers. A microchannel was drilled through one core of the TCF by means of femtosecond laser micromachining to create one arm of the proposed interferometer, and the other core worked as the second arm. Such a fiber interferometer exhibits an ultrahigh RI sensitivity of 10981nm/RIU and a low temperature cross-sensitivity of 3.96×106RIU/°C. Moreover, the ultra-compact device size and all-fiber configuration make it very suitable for highly sensitive RI sensing at precise location.

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(140.3390) Lasers and laser optics : Laser materials processing
(140.3948) Lasers and laser optics : Microcavity devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: May 29, 2014
Revised Manuscript: July 18, 2014
Manuscript Accepted: July 21, 2014
Published: August 18, 2014

Virtual Issues
Vol. 9, Iss. 11 Virtual Journal for Biomedical Optics

Zhengyong Li, Changrui Liao, Yiping Wang, Xiaopeng Dong, Shen Liu, Kaiming Yang, Qiao Wang, and Jiangtao Zhou, "Ultrasensitive refractive index sensor based on a Mach–Zehnder interferometer created in twin-core fiber," Opt. Lett. 39, 4982-4985 (2014)

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